.flexBox{
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 20px;
}
.son_box1{
    width: 50%;
    height: 400px;
    background-color: red;
}
.son_box2{
    width: 50%;
    height: 400px;
    background-color: aquamarine;
}